Zobrazeno 1 - 10
of 617
pro vyhledávání: '"A. Quartin"'
Cosmological data collected on a sphere, such as CMB anisotropies, are typically represented by the spherical harmonic coefficients, denoted as $a_{\ell m}$. The angular power spectrum, or $C_\ell$, serves as the fundamental estimator of the variance
Externí odkaz:
http://arxiv.org/abs/2411.08087
With the increasing precision of recent cosmological surveys and the discovery of important tensions within the $\Lambda$CDM paradigm, it is becoming more and more important to develop tools to quantify accurately the discordance between different pr
Externí odkaz:
http://arxiv.org/abs/2408.08385
In this work we provide a data analysis of the BOSS galaxy clustering data with the recently proposed FreePower method, which adopts as parameters the power spectrum band-powers instead of a specific cosmological parametrization. It relies on the Alc
Externí odkaz:
http://arxiv.org/abs/2406.15347
Autor:
Alfradique, Viviane, Castro, Tiago, Marra, Valerio, Quartin, Miguel, Giocoli, Carlo, Monaco, Pierluigi
Publikováno v:
The Open Journal of Astrophysics 7 (October) 2024
Gravitational lensing is a crucial tool for exploring cosmic phenomena, providing insights into galaxy clustering, dark matter, and dark energy. Given the substantial computational demands of $N$-body simulations, approximate methods like $\texttt{PI
Externí odkaz:
http://arxiv.org/abs/2405.00147
Autor:
del Pino, A., López-Sanjuan, C., Hernán-Caballero, A., Domínguez-Sánchez, H., von Marttens, R., Fernández-Ontiveros, J. A., Coelho, P. R. T., Lumbreras-Calle, A., Vega-Ferrero, J., Jimenez-Esteban, F., Cruz, P., Marra, V., Quartin, M., Galarza, C. A., Angulo, R. E., Cenarro, A. J., Cristóbal-Hornillos, D., Dupke, R. A., Ederoclite, A., Hernández-Monteagudo, C., Marín-Franch, A., Moles, M., Sodré Jr., L., Varela, J., Ramió, H. Vázquez
Publikováno v:
A&A 691, A221 (2024)
With its 12 optical filters, the Javalambre-Photometric Local Universe Survey (J-PLUS) provides an unprecedented multicolor view of the local Universe. The third data release (DR3) covers 3,192 deg$^2$ and contains 47.4 million objects. However, the
Externí odkaz:
http://arxiv.org/abs/2404.16567
We propose a methodology to measure the cosmological spatial curvature by employing the deviation from statistical isotropy due to the Alcock-Paczy\'nski effect of large scale galaxy clustering. This approach has a higher degree of model independence
Externí odkaz:
http://arxiv.org/abs/2404.13124
Tensions between cosmological parameters derived through different channels can be a genuine signature of new physics that $\Lambda$CDM as the standard model is not able to reproduce, in particular in the missing consistency between parameter estimat
Externí odkaz:
http://arxiv.org/abs/2402.19100
Publikováno v:
JCAP08(2024)007
Cosmological distances are fundamental observables in cosmology. The luminosity ($D_L$), angular diameter ($D_A$) and gravitational wave ($D_{\rm GW}$) distances are all trivially related in General Relativity assuming no significant absorption of ph
Externí odkaz:
http://arxiv.org/abs/2311.17176
Publikováno v:
MNRAS, 528 (2024) 2
We test the possibility that the black holes (BHs) detected by LIGO-Virgo-KAGRA (LVK) may be cosmologically coupled and grow in mass proportionally to the cosmological scale factor to some power $k$, which may also act as the dark energy source if $k
Externí odkaz:
http://arxiv.org/abs/2307.02474
Publikováno v:
JCAP 01(2024)001
A new and promising avenue was recently developed for analyzing large-scale structure data with a model-independent approach, in which the linear power spectrum shape is parametrized with a large number of freely varying wavebands rather than by assu
Externí odkaz:
http://arxiv.org/abs/2307.02117